Tempest Hot Air Drying System Installation Instructions Hamada RS/VS34II X88-120 1/98
GENERAL INFORMATION ATTENTION TEMPEST DRYER OWNER! Accel Graphic Systems provides parts and service through its authorized distributors and dealers. Therefore, all requests for parts and service should be directed to your local dealer. The philosophy of Accel Graphic Systems is to continually improve all of its products. Written notices of changes and improvements are sent to Accel Graphic Systems' Dealers. If the operating characteristics or the appearance of your product differs from those described in this manual, please contact your local Accel Graphic Systems Dealer for updated information and assistance. Always update your equipment when improvements are made available, especially those related to safety. YOUR AUTHORIZED TEMPEST DEALER IS: THE SERIAL NUMBER OF YOUR TEMPEST HOT AIR DRYING SYSTEM IS: CONTROL BOX FAN UNIT 2 TECHNICAL ASSISTANCE For technical assistance during the installation, please contact: ACCEL GRAPHIC SYSTEMS 11103 Indian Trail Dallas, TX 75229 PHONE (972) 484-6808 FAX (800) 365-6510 E-MAIL accel@dallas.net WEB SITE www.accelgraphicsystems.com
GENERAL INFORMATION ELECTRICAL REQUIREMENTS 220 VAC 50/60 HZ 20 AMP DEDICATED LINE NEMA L620R Receptacle IMPORTANT INFORMATION The use of heat to accelerate drying may require more frequent lubrication and/or use of a high temperature lubricant in the delivery of the press. Please consult your press manufacturer for specific recommendations. SAFETY INFORMATION The Tempest Dryer contains high voltage and hot surfaces. Never attempt to service or work on the unit unless the power is shut off and the unit is cool. Visually inspect the thermistors (triangular shaped objects arranged in a honeycombed pattern on the underside of the unit) weekly. If a thermistor is damaged or cracked, do not operate the dryer. Contact Accel immediately for a replacement part. The fans should be turned on and set at the lowest speed ("0" on the dial) when running just spray powder and no heat. This prevents spray powder from accumulating in the thermistors and housings. TERMINOLOGY OPS = Operator's Side NOPS= Non Operator's Side 3
GENERAL INFORMATION HOT AIR VS INFRARED WHAT MAKES TEMPEST WORK Although the technology behind the Tempest dryer was significant enough to be awarded the GATF Intertech Award it is by no means new. In fact, thermistors have been in use for many years. They were originally used in motors and other devices as a heat controller and later used in refrigeration to turn compressors on and off. It is only in the last 10 years or so that thermistors have been used as a heater. Heat is generated by the thermistor because of the difficulty of electricity travelling through it when it is a conductor. The thermistor acts as a conductor until it reaches its set temperature and then it becomes a resistor. A thermistor is basically a coated semiconductor designed to switch from a conductor to a resistor at an established temperature. When a current is applied to the thermistor it initially uses a large amount of electricity and heats up very quickly until it reaches its maximum set temperature. At this point it should not use any more electricity. However, air that is passed through the holes in the thermistor causes it to cool. This activates the thermistor to start using more power again so is can get back to its set temperature. The thermistor is constantly regenerating itself to stay at a constant temperature. This process is called autostabilization. Thermistors are also the key element that makes the Tempest dryer safe. Because the set temperature of the thermistor is lower than the flash point of paper, you can place even the most easily burned substrate such as tissue paper, on top of the thermistor element without causing a fire. The tissue won't even char, let alone ignite. If you were to do the same with an IR element, a fire could be started in a matter of seconds. This is particularly important if a jam occurs in the delivery. The objective of any drying system is to raise the pile temperature to accelerate the drying of the ink. However, heating the paper too much can aggravate problems such as blocking, setoff, mottle, loss of gloss, and loss of halftone definition. Too much heat can also cause the paper to shrink which can cause register problems in multiple pass work. The Tempest dryer can keep the pile at a lower temperature than IR and still effectively set the ink film. 4
GENERAL INFORMATION IR dryers use very high temperatures and a fixed amount of electricity. The heat generated from an IR dryer can cause premature wear of press parts. Because the thermistors used in the Tempest dryer use lower temperatures the chance of premature wear is reduced. HOW DRYING IS ACCOMPLISHED WITH TEMPEST Tempest "sets" the surface of the ink to prevent setoff from one sheet to another and to minimize the use of powder. Tempest accelerates the final drying of oil based inks by raising the temperature of the delivery stack. KEY FACTORS TO REMEMBER ABOUT DRYERS FOR SMALL OFFSET PRESSES. Do not expect a dryer to "instantly" dry the ink. Only UV inks and coating dry instantly. The technology and hazards of such systems make them cost prohibitive on small offset presses. Some jobs may require spray powder. Because dryers for small offset presses do not dry ink instantly, powder will be required from time to time. However, you should expect to see a significant decrease in the amount of powder needed on a regular basis. Drying time is dependent upon the press speed, paper stock, ink coverage, type of ink etc. Do not expect a dryer to accelerate the drying of rubber based inks. These inks dry by absorption into the stock and heat does not accelerate this process. 5
Diagram A 6
INSTALLATION 1 Disconnect the electrical power to the press. 2 Remove the OPS and NOPS delivery side covers, the NOPS side cover below the #2 printing unit, the OPS feeder side cover and the OPS side cover for the #1 printing unit. 3 Remove the spray head assembles from the tie bar as shown in Diagram A. 7
Diagram B Diagram C 8
INSTALLATION 4 Pull the powder spray hoses out of the press. Cut the hoses near the spray hopper leaving about 4" of hose attached to each outlet. 5 Remove the OPS delivery pile lift chain retaining stud. This stud is next to the pile chain sprocket in the delivery. Install the provided OPS mounting bracket to the press using the provided M8 bolt and the delivery pile lift chain retaining stud to secure it as shown in diagram B. 6 On the NOPS, locate the M6 hex head bolt approximately one inch to the right of and 1 1/2"above the delivery pile lift chain retaining stud. Remove this bolt and the delivery pile lift chain retaining stud. Install the NOPS mounting bracket as shown in diagram C. Using the delivery pile chain retaining stud and the supplied M6 hex bolt. 9
Diagram D Diagram E Diagram F 10
INSTALLATION 7 Secure the Tempest drying unit to the mounting brackets with the provided hardware as shown in diagram D. Use the provided tie wraps to secure the cable away from all moving parts. 8 With the provided hardware install the new powder spray bar as shown in diagram E. 9 Using the provided hardware install the exhaust fan assembly to the guard on the end of the delivery as shown in diagram F. The upper bolts come through the slots in the guard, through the fan and screw into the deflector outlet. The lower bolts will be below the guard. Make sure that the deflector outlet is pointing down. Squeeze the connector through a slot in the guard. Use the provided stick on tie wrap mounts to secure the wires to the inside of the guard while routing it toward the NOPS. 11
Diagram G Diagram H Diagram I 12
INSTALLATION 10 THIS STEP ONLY FOR PRESSES EQUIPPED WITH THE FAC- TORY SPRAY SYSTEM: Route the provided hose from the fittings on the spray heads, through the hole in the press frame, behind the electrical cabinet, to the powder spray hopper. Use the supplied barbed reducer fittings to connect the new hoses to the existing hoses that were cut in Step 4. Use the provided tie-wraps to secure the hoses as necessary to clear all moving parts. 11 Locate the cam activated powder spray limit switch on the NOPS near the feeder. Use a tie-wrap to permanently close the switch. 12 If the press is already equipped with an Accel PowderPro spray system then it may already have the switch installed in the next step. If the switch is already installed then skip to step 13. Locate the two solenoids on the OPS as shown in diagram G. Replace the two outside mounting bolts on the upper solenoid with the longer bolts provided. Using the provided M4 nuts and flat washers, install the switch assembly to the underside of the solenoid as shown in diagram H. Before tightening the nuts, make sure that the switch arm just contacts the spring stud on the lever of the lower solenoid as shown in diagram I. 13
Diagram J Diagram K 14
INSTALLATION 13 Remove the panel from the press that seperates the delivery area from the area that contains the drive motor. Using the diagram as a guide drill four 9/32" dia. holes in the panel. Using the provided hardware secure the Tempest electrical box to the inside of the panel as shown in diagram J. Replace the panel on the press. Route the exhaust fan cable into the delivery and connect it to the exhaust fans installed in Step 9. Route the impression signal cable through the press to the switch installed in the previous step. Connect the wires in this cable to one set of normally open contact on the switch as shown in diagram K. Use the provided tie-wraps to secure the cables as necessary to clear any moving parts of the machine. 14 Remove the cover from the Tempest electrical box and insert the dryer cable through the strain relief on the bottom of the box. Remove the twelve position connector (only six positions are numbered) from the board and insert the wires into the connector by matching the numbered tags on the wires to the matching positions on the connector. Secure the ground wire to the stud on the inside of the box. Replace the connector on the board and tighten the strain relief. Replace the cover on the box. 15 Place the Tempest remote control unit on the press where it is convenient for the operator. The remote is held in place with the magnetic tape attached to the back of the remote. 15
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INSTALLATION 16 Replace all covers removed for installation. Rotate the press slowly by hand to make sure the dryer, dryer cables and powder spray hoses clear each gripper bar in the delivery. 17
OPERATION & MAINTENANCE HOW DRYING IS ACCELERATED WITH TEMPEST HOW TEMPEST WORKS Tempest creates a two step drying process when used with oil base inks. 1. Skinning the surface of the ink with hot air to prevent set off. 2. Accelerating the final drying process approximately 20 degrees over the cold stack temperature in the feeder. Heat accelerates the drying process, called oxidation and reduction, of oil based inks. In general, dryers, including infrared, do not work well with rubber or acrylic based inks. These inks should be avoided when maximum results are desired. 1. When voltage is applied to the thermistors, (triangular shaped coated semiconductors arranged in a honeycomb pattern), they begin to heat. 2. Thermistors heat to a predetermined temperature, in this case about 400 F, and remain at that temperature. This is known as autostabilization. 3. The fans blow air down towards and through the thermistors, creating a flow of hot air to the sheet. 4. Drying of the ink occurs in the two step process as described above. No dryer totally eliminates the need for spray powder. There may be some jobs, for example a heavy solid on a high gloss sheet, where powder is required. Overall, Tempest should reduce your spray powder usage significantly, leaving you with a better printed product and cleaner working environment. TEMPEST OPERATION NORMAL OPERATION Pressing the HEAT switch will illuminate both the green and yellow LEDs on the remote control unit. The green LED indicates that the fans (both dryer and exhaust fans if so equipped) are running while the yellow LED indicates that the dryer is armed and the heat will come on automatically when the press goes on impression. When the press does go on impression, the red LED will illuminate indicating that the heat is on. Pressing the heat button again will disarm the heat mode but the fans will continue to run. To turn the unit OFF press the FAN switch at any time. FAN ONLY OPERATION To operate only the fans, press the FAN switch. The green LED will illuminate and the fans will come on (both the dryer and exhaust fans if so equipped). The heat mode of the dryer is not armed and will not come on with impression. To turn the fans OFF press the FAN switch again. FAN SPEED CONTROL To adjust the fan to a higher setting, press the up arrow on the remote control unit. To decrease the fan speed press the down arrow on the remote. The fans will automatically go to the minimum speed setting for a few seconds when the press goes on impression and then they return to the previous setting. This reduction in fan speed allows the dryer to heat up more quickly. 18
OPERATION & MAINTENANCE INITIAL SETTINGS Try running Tempest with the fan speed at "4" with the switch on "HEAT". After about 1" of paper stacked in the delivery, insert the thermometer into the center of the stack. Allow the thermometer to stabilize. It should be approximately 20 degrees above the initial pile temperature. If the temperature is below that, increase the fan speed slightly. If the temperature is above that, decrease the fan speed slightly. FACTORS THAT EFFECT DRYING 1. Speed of the press. 2. Amount of ink coverage and color. 3. Type of stock being printed. 4. Initial temperature of paper. In time and with practice you will learn which settings are best for your particular shop. KEYS TO REMEMBER 1. The Tempest takes about 12 sheets to come up to full power. The dryer remains on as long as paper is being fed. It does not cycle like an infrared dryer. 2. The pile temperature should be approximately 20 degrees above the initial pile temperature for optimum drying. 3. Use spray powder only when absolutely necessary. A little spray powder goes a long way. Use it sparingly. 4. Inspect the Tempest weekly. MAINTENANCE 1. Inspect the dryer weekly. If the thermistors are cracked or have been damaged, do not operate the dryer. Call Accel immediately. 2. Never squirt cleaning solvents, water or any other liquids into the dryer. This may damage electrical components. 3. Any spray powder that accumulates in the dryer should be vacuumed out, not blown out. 4. Make sure all heat shields and guards are in place before operating the dryer printing press. 19
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11103 Indian Trail, Dallas, TX 75229 Phone 972-484-6808, Fax 800-365-6510 E-mail accel@dallas.net, Web Site www.accelgraphicsystems.com